Make rake clobber remote test_root/*_repo directories that are used and should be cleaned up by tests

Conflicts:
	common/lib/xmodule/xmodule/capa_module.py
	common/lib/xmodule/xmodule/modulestore/xml.py
	lms/djangoapps/courseware/views.py
	lms/templates/index.html
	lms/templates/info.html
	lms/templates/main.html
	lms/templates/navigation.html
	requirements.txt

Rewrite CMS JavaScript to use Backbone

Conflicts:
	cms/djangoapps/contentstore/views.py
	cms/static/coffee/unit.coffee
	cms/templates/index.html
	cms/templates/widgets/sequence-edit.html

Enable interaction with github

Conflicts:
	common/lib/xmodule/xmodule/xml_module.py